Which versions of selenium-session are malicious?

The following npm versions of selenium-session are flagged malicious: 1.0.5. Treat any of these as compromised.

How do I remediate selenium-session if I installed it?

selenium-session is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed selenium-session — how do I know if it already compromised me?

If selenium-session was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is selenium-session part of a known attack campaign?

Yes — selenium-session is associated with the RLMA-2025-06475 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find selenium-session across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for selenium-session (version 1.0.5).

Malicious package

selenium-sessionnpm

Advisory published Nov 25, 2025Updated Dec 24, 2025

selenium-session is a confirmed malicious npm package (MAL-2025-191421) that steals credentials and exfiltrates sensitive data (malicious version 1.0.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in selenium-session (npm)

MAL-2025-191421

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall selenium-session

What this malware does

The package selenium-session was found to contain malicious code.

This package was compromised by the Sha1-Hulud: The Second Coming NPM worm. The malicious payload steals tokens and credentials and publishes them to GitHub. The worm will propogate itself to NPM packages the user owns and establish persistence is a GitHub action. The package may also destroy the user's home directory.

Malicious versions

1 flagged

1.0.5

Indicators of compromise (SHA-256)

a5e6b3327c7ae84733f196eb2c1c230fdabd391aea3616977cefb5b555238cab

9ecd0e6dc81b318ff25ac39f8955edd9409fd4ffec088409a60da0570a050691

3f0d38854c965bbf66a31908c2d726425f85096ae124af242126b9158caefefc

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for selenium-session (version 1.0.5).
If you installed it — respond
selenium-session is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If selenium-session was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. selenium-session on npm has been identified as a malicious package (version 1.0.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-06475

References

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks selenium-session-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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